Video from NEON on how lidar remote sensing works.
Also refer to this excellent resource from neondataskills.org on more basic information on lidar and its many applications.
OpenTopography: How to produce DEMs and hillshade in kmz and other formats
Accessing Shuttle Radar Topography Mission (SRTM) DEM data from OpenTopography
Downloading DEMs for Google Earth
Using OpenTopography Data in ArcGIS
YouTube playlist for video tutorials for using data and data products downloaded from OpenTopography in ArcGIS.